Darmstadt 2008 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 5: Interaction with intense laser pulses I: Atoms
A 5.7: Vortrag
Dienstag, 11. März 2008, 12:45–13:00, 3C
Strong field tunneling without ionization — Thomas Nubbemeyer1, •Karsten Gorling1, Alejandro Saenz2, Ulli Eichmann1, and Wolfgang Sandner1 — 1Max Born Institut, Max Born Str 2a 12489 Berlin — 2AG Moderne Optik, Institut für Physik, Humboldt-Universität zu Berlin
In the tunneling regime of strong laser field ionization we measure a substantial fraction of neutral atoms surviving the laser pulse in excited states. The measured neutral atom yield extends over several orders of magnitude as a function of laser intensity. Our findings are compatible with the strong field tunneling-plus-rescattering model, confirming the existence of a widely unexplored neutral exit channel which originates from tunneling within a narrow range of the laser field phase (frustrated tunneling ionization). Both quantum mechanical and semi-classical calculations show that the interaction with combined Coulomb and laser fields leads to a neutral excited state distribution centered around n=6−10, in agreement with the experimental results.